Its a perfect bridge piece for decks that want both mana and card advantage
Since starting this list we have an Eldrazi Boar spoiled that also looks set to take a seat in this top ten
Seedglaive Mentor One generic, one red, one white creature Mouse Soldier 3/2 Uncommon Vigilance, haste Valiant Whenever Seedglaive Mentor becomes the target of a spell or ability you control for the first time each turn, put a +1/+1 counter on it
Later in the year, sets released between April and August will be getting spaced-out releases in two-month intervals
Prereleases are great because the set is totally new, the footing is fairly equal as everybody plays with the set for the very first time, and you're all just relaxing and having fun exploring the new cards
The good news is, that ability is good on lots of board states